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Archived

Avalanche Forecast

Apr 17th, 2019–Apr 18th, 2019
Alpine
3: Considerable
The avalanche danger rating in the alpine will be considerable
Treeline
2: Moderate
The avalanche danger rating at treeline will be moderate
Below Treeline
1: Low
The avalanche danger rating below treeline will be low
Alpine
4: High
The avalanche danger rating in the alpine will be high
Treeline
4: High
The avalanche danger rating at treeline will be high
Below Treeline
2: Moderate
The avalanche danger rating below treeline will be moderate
Alpine
3: Considerable
The avalanche danger rating in the alpine will be considerable
Treeline
2: Moderate
The avalanche danger rating at treeline will be moderate
Below Treeline
1: Low
The avalanche danger rating below treeline will be low

Regions: Glacier.

High quality powder skiing can be found in the Alpine on North and East aspects. Reactive storm slabs are also be lurking in the Alpine and at Tree Line.

Weather Forecast

Today: Snow ending late this morning then a mix of sun and cloud, snowfall 2-4cm, FL rising to 1900m, and Strong Southerly winds. Thursday: 30cm of new snow in the Alpine, probably 30mm of rain BTL, FL making it to 2400m. Friday: Flurries.

Snowpack Summary

Another 10cm at Mt Fidelity brings our storm total to 45cm since Sunday. Strong South winds overnight created soft slabs in the alpine and exposed areas of treeline. Storm slabs overlie melt-freeze crusts on all asp, and elev, except Nth alpine. Poor cr recovery BTL with the new snow insulating the melt freeze crust, which covers isothermal snow.

Avalanche Summary

No new avalanches have been observed in the HWY corridor, or reported from the back country since Sunday. On Sunday there was a skier remote size 2 triggered on Video Peak. Six people in the area, three involved, no gear lost, no burials, & no injuries. The parties that triggered the avalanche had deviated from the regular ascent route to Video Pk.

Confidence

Due to the number and quality of field observations

Avalanche Problems

Storm Slabs

45cm + of storm snow along with moderate to strong S-SW winds, formed storm slabs in the alpine and exposed areas of treeline. These slabs were easily triggered by skiers on Sunday, initiating from 50m away.

  • Be careful with wind loaded pockets, especially near ridge crests and roll-overs.
  • Use caution in lee areas in the alpine and treeline. Storm snow is forming reactive slabs.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Likely

Expected Size: 1 - 2.5

Loose Wet

If the sun comes out today, our new snow will turn moist and avalanche easily. Storm snow, warm temperatures, and possible strong solar input is a great recipe for a natural cycle. Steep solar asp will be the primary concern.

  • Daytime warming will weaken surface layers.

Aspects: South East, South, South West, West, North West.

Elevations: All elevations.

Likelihood: Unlikely - Possible

Expected Size: 1 - 2